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      <a id="chanctrl"></a>
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      <a id="IndexChanctrl" class="indexterm"></a>
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        <h2>
          <span class="refentrytitle">chanctrl</span>
        </h2>
        <p>chanctrl — 
      Get the current value of a MIDI channel controller.
          </p>
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      <div class="refsect1">
        <a id="idp93337296"></a>
        <h2>Description</h2>
        <p>
      Get the current value of a controller and optionally map it onto specified range.
    </p>
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      <div class="refsect1">
        <a id="idp93338560"></a>
        <h2>Syntax</h2>
        <pre class="synopsis">ival <span class="command"><strong>chanctrl</strong></span> ichnl, ictlno [, ilow] [, ihigh]</pre>
        <pre class="synopsis">kval <span class="command"><strong>chanctrl</strong></span> ichnl, ictlno [, ilow] [, ihigh]</pre>
      </div>
      <div class="refsect1">
        <a id="idp93413488"></a>
        <h2>Initialization</h2>
        <p>
      <span class="emphasis"><em>ichnl</em></span> -- the MIDI channel (1-16).
    </p>
        <p>
      <span class="emphasis"><em>ictlno</em></span> -- the MIDI controller number (0-127).
    </p>
        <p>
      <span class="emphasis"><em>ilow</em></span>, <span class="emphasis"><em>ihigh</em></span> -- low and high ranges for mapping
    </p>
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      <div class="refsect1">
        <a id="idp93417280"></a>
        <h2>Examples</h2>
        <p>
      Here is an example of the chanctrl opcode. It uses the file <a class="ulink" href="examples/chanctrl.csd" target="_top"><em class="citetitle">chanctrl.csd</em></a>.

      </p>
        <div class="example">
          <a id="idp93419136"></a>
          <p class="title">
            <strong>Example 108. Example of the chanctrl opcode.</strong>
          </p>
          <div class="example-contents">
            <p>See the sections <a class="link" href="UsingRealTime.html" title="Real-Time Audio"><em class="citetitle">Real-time Audio</em></a> and <a class="link" href="CommandFlags.html" title="Csound command line"><em class="citetitle">Command Line Flags</em></a> for more information on using command line flags.</p>
            <pre class="programlisting">
<span class="csdtag">&lt;CsoundSynthesizer&gt;</span>
<span class="csdtag">&lt;CsOptions&gt;</span>
<span class="comment">; Select audio/midi flags here according to platform</span>
<span class="comment">; Audio out   No messages  MIDI in</span>
-odac            -d         -M0  <span class="comment">;;;RT audio I/O with MIDI in</span>
<span class="comment">;-iadc    ;;;uncomment -iadc if RT audio input is needed too</span>
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
<span class="comment">; -o chanctrl.wav -W ;;; for file output any platform</span>
<span class="csdtag">&lt;/CsOptions&gt;</span>
<span class="csdtag">&lt;CsInstruments&gt;</span>

<span class="ohdr">sr</span> <span class="op">=</span> 44100
<span class="ohdr">ksmps</span> <span class="op">=</span> 32
<span class="ohdr">nchnls</span> <span class="op">=</span> 2
<span class="ohdr">0dbfs</span> <span class="op">=</span> 1

<span class="oblock">instr</span> 1	<span class="comment">; press your midi keyboard and move your midi controller to see result</span>

ichnl  <span class="op">=</span> 1		<span class="comment">;MIDI note inputs on channel 1</span>
ictlno <span class="op">=</span> 7		<span class="comment">;use midi volume controller </span>
kch  <span class="opc">chanctrl</span> ichnl, 7	<span class="comment">;to control amplitude of oscil</span>
     <span class="opc">printk2</span>  kch

asig <span class="opc">oscil</span> kch<span class="op">*</span>(1<span class="op">/</span>127), 220, 1
     <span class="opc">outs</span>  asig, asig
<span class="oblock">endin</span>

<span class="csdtag">&lt;/CsInstruments&gt;</span>
<span class="csdtag">&lt;CsScore&gt;</span>
<span class="comment">;Dummy f-table to give time for real-time MIDI events</span>
<span class="stamnt">f</span> 0 30
<span class="comment">;sine wave.</span>
<span class="stamnt">f</span> 1 0 16384 10 1
<span class="stamnt">e</span>

<span class="csdtag">&lt;/CsScore&gt;</span>
<span class="csdtag">&lt;/CsoundSynthesizer&gt;</span>
</pre>
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        <p><br class="example-break" />
    </p>
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      <div class="refsect1">
        <a id="idp93423424"></a>
        <h2>Credits</h2>
        <p>
      </p>
        <table border="0" summary="Simple list" class="simplelist">
          <tr>
            <td>Author: Mike Berry</td>
          </tr>
          <tr>
            <td>Mills College</td>
          </tr>
          <tr>
            <td>May, 1997</td>
          </tr>
        </table>
        <p>
    </p>
        <p>Thanks goes to Rasmus Ekman for pointing out the correct MIDI channel and controller number ranges.</p>
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